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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e133380b522ca9ccd9440b4316828d5ec9a8345001b4d5e26bec5d9ee7e4e5' 
  AND token = '8KSjpInJmxuEAaJYpUjTPYu183Cu28w/BDWFyxtCHds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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