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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b9c0ccb2b369e6a7c579ed68846d4df8b5ca8f5f71d4baaab3d8998aeb1aca' 
  AND token = '1+ym5Q0i86ktKkDyxefI3XRjbTObpBq6NSu3fPQeZ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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