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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2576c4d5cc2b3d9ea645e38302b0dbd7df31573b575d2af03ec49ed7640bfdd8' 
  AND token = '0ne4ulR8CZA+WTAyWVCmC6/N4uADYkOySB0mMHKISqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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