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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73282191a3e32bb691a3c8639c0321a3bcf81fba9676d7035aa20d66faa9063' 
  AND token = 'NFYmhRNfV4WUCJG82I+l140YOLE8j2/yP8prC4YCvfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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