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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6ed3e70be7936a7a1b9719de346f2340d0df507e57d00826f36f20ba3587ce' 
  AND token = '951E3PXF9XqXRtLz7yWPQf9cT2U3hF4NKvjTZCHvLDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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