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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40449a5b8f158c3a569a825699d8e915774aaa13ce0d583ed9e289b0b5723fd' 
  AND token = '/x2Ng2yoV+W/zkdNTsKgZbn9ptppAJDpFQgW2iSrgIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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