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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c422a28160ab1d93b80bb72f8f40025e488e82d927f2f00adaf56590ff848f5c' 
  AND token = 'jtCnEqetsXkOaXLPwh3lET4z4QEsJP4vIqkSqjzljV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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