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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9501875e636e19ffa47782021c182d4c02f572b20ad582d0475acd9956ec4d' 
  AND token = 'zSY5GphXpWul69g0kCPPRQ07EuEX7rRLOf7U6IRJEY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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