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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c57c0b5c3b607000245d13755033dc7a2117af5e4d7a020fa7f2e2a9df800ed' 
  AND token = '91H+QFBrhSg+lNKgsE8wAnR0jEav1vwRdgyNcll1GY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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