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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e16491a61e5dc9e8d4910118d9cc98bd9f370fe0d4da659c0603f3e4cb1994' 
  AND token = 'nDrovPsaOnqthlxc3IK+9gOiyaVsCAI0jLOmijMGybw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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