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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c554ac11f0c4e9ceb8be9b0e371778d13fad1a1283011ac8af6cff7c686547' 
  AND token = 'JxXaW/SvyN5zArZ3oQQQgUjixcohlDNdGoySEV3QV2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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