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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d214c91465977deffaab6d1f2b1b3b2b14b96efff13b3561657a265e5fe0fa1' 
  AND token = 'EITZ2rbiW/ROfqhsZkN5ZzH2v3On8Zej+BMYuf2ci34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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