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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efc53acbc49f8fedfb4732e1baabb609a2ac4fc41bd868e8c4ce899c225794b' 
  AND token = 'M4nUd4Oxh0q4t3Q8N4yxl9FfKaWDHp5INe8fHgTurBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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