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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811b2c6f9a7030f93fa75559b7f6b5328b54963183ab4ce50a49b6b83caa1d99' 
  AND token = 'RFpVvhFt8oZHYwsqMHexSnQkVec4m4zwrP99OolaoQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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