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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c714ac567d367ab0526e6935e17e389e92bce069c1b53898797e0a1c9bdbdb65' 
  AND token = 'dTa+Q0AdeUqg/HqFkp6su/H05CNWWIfV/sN6ajBsBwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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