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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191f812f73e56ef646d43e8ebe4b3ca257d0b0d1fffcea62b76bfd05edf8de8d' 
  AND token = 'IZAp8rQLR+6rkg0PrQHpxxhqEAIH+U3Up7kMSRrssaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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