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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774c9db91762f7714f506c1078310ab7ee0b80fa24872702bce0368be75e72dc' 
  AND token = 'gDSNxP5NyULYJXhhJOqzuaTeoZo+pL0p70az6Z3D6i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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