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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd408aa1dc9b9fe2e498d6a2f431c02b54d13dba0813b9e30d8977bf40864299' 
  AND token = 'x2mxV2Xo02g1mryk9O8z+ebdPfNXrLc33zjf2um20oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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