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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f79cc97a9b3b2bc4f0b7d4c75f914c7300a89bab70557e09e0e03c13ac66ee' 
  AND token = 'E8UqPjpBEqy4fCwY0pWUL1bv+RRkB3Zq+oK4z+2EeTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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