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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0d5d3eb98e52ca7df23be6c66c7719e442481d31f640c62f483dd7d3a80dbd' 
  AND token = 'Ota0utxYiFJKCS2VEaR8/7hB10aHHmTgRVV4r3HtNGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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