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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193bd2c07d3d1cd490466f759c0422a8ae97a375d901bb6770d441e1d0cad7a9' 
  AND token = 'VfgTKq314tNWIm+HQAr4TiX4leEHcRFUEEnj+NU0E6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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