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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021ea45c967c889dc04504a3217d143b07f2d09e12751923714d1822e703f41e' 
  AND token = 'NZQf+ttggrX0RyhfUGlzc2piuVTRdqN7tymzKMNFaFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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