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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1712f552bc30311c94c2ff476e1abf6954bdc83936b277e44c460072bd0c371c' 
  AND token = 'V0wmtyPkJz9UGEUu/MYko7nK3Q5DFcNP4js3LdR2COA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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