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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8fd4d1f4c7e8dd124fa4e60ec0cd40a3779b2716b41c2a64dd11b2271c3e2d' 
  AND token = 'GqfxmoPek0b20G9/TXn8+922U7FUjGUiCbAalOpkAHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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