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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ed4c61959182033f6dc657285045a1a3d0d478288b1a133d0f0f625353e80d' 
  AND token = 'NSd7mTW2gXY7glwXn1S5AzM220HwbITe2VZQjz/BHW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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