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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c9da677f1950a00b7e5345bd5171629b3dd29053b9d4591ac316a861769055' 
  AND token = 'QVjaYIOGUqdnRSCg5AhJb8OiY77o+K/Rrc++sb5pPAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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