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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea8d4785f63317fa733acc4cde4e492d0744a795480e322104a333c731bcb1c' 
  AND token = 'Grrb7nuuWQ376i0QGPYzxEO4Kc/WH5S2yOdHaAFMiyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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