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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c864fb794df9ef9ba9a6a90444f39b8ce0ae794cdc19e78dc97138812a385a44' 
  AND token = '0toDUiBoEetyUfvCGkp7dSFzPPsti7y4FAq5T8KV9xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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