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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7efa1592e3ca13ef4b052fe4a60ef091a030d033f9a2234f710403f982d260e' 
  AND token = 'xoQ07xKZ0vZTiRH2oD35P2s4DV6WsvLE+XXpuq4gZk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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