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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8334cddb36bb98ded4a330e51babc867515b47b8ec1c7e1baa937dfe7b146458' 
  AND token = 'ft47z3RLBkKovTknYuJ//ljy86BOlEfnzK1XYNzJwSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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