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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662475e0fa156820f517caa647811e5376de48a00240378e4d846d58a60de429' 
  AND token = 'quqJrTBcMZTAu0t0h09y+WYj4xumOfiAeUqdQzLplXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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