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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28891fbfad08b7191acc2fa8b7657b3dff39ad432a2da9e90b23fcb9acd8a590' 
  AND token = 'g/+HorhGDREj9cmIa46l6twrjgT1gOdQ2m4rqTDAlaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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