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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2529a7eb90fae190d904d757edd00d93fc9e16a38bf5b3e5c34681fd96192ee8' 
  AND token = 'vPbT2Idcc6DPthdMRHGhgTEEqunB73fl4qkrrC0yojQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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