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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302dcbd2a335727306f73005e3a27a806ff48a40110a2ac4340d90a0fd469800' 
  AND token = 'pmpavQt48s1c/xgIPG2C7M6wS1/U/FjFizGabTAV2MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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