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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0802eb34e23c842a0426b1d2b0ff2bd352cb144697bc0f2076fc14019149d2' 
  AND token = '8No0Q9EL59UC1xzthBQM6RXtB8aZTNqrIMaPNOigvJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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