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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e0bf5b11414ae2cf2f274be218398331990116d980c50aaa7a3004f3efebde' 
  AND token = 'iXrEyzG0oyk1fU1gL/OdFMlWgO8QaQ1tFlD6+GG8KE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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