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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c5c354cadb18f1ade31ecbd8b6413a2d30c6ad9ab56020174c39ba2e0cc5cb' 
  AND token = 'gb/JUfFWHWR/1+djZWaBZ5Pc8/0q5CIrw/mWpODmDkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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