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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf98a302e0ddbe1e0416ce2ded08b2f5a631b2b633950dba2de922af9b63cf91' 
  AND token = 'b5aLdDRJcHbeJTT3HNN3tVCxzgSmbkHl6gCphMyZAdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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