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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c674b1b313cdfbe9af42687d70919407f1ed777bcab10f7938dca3ffb6e9b2a9' 
  AND token = 'DSD9VYhzp453CW5aC2hKY71ZZJzt62DO40yJ60KuRKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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