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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188afb8f5eb5bae5507630f17b24da63e39191a58d4b1d87bb49547d0cbd85c0' 
  AND token = '3OUI2pGdyPFCE3h4KD7j+UlurbqDtBGL9dEjbTMA1co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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