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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfd429db5fd802ab208ce8ea9d722350d6c4a09790a1ff54b32e6abb2cf88bc' 
  AND token = 'IA0cCaM7qN2WRZfSUmDcdgZSXbPZGHdiKW+jgoCGRBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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