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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945dbf9750068e3e8d609ee57d591f477b2835cceab74f6d6c436d6e29ad3ee3' 
  AND token = 'B/NDxaG66x3pKTE+4fhVNorEdrM6wiBAON6YFJLx2bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}