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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff127354a48960b019c3b292ebbb4609f48c10fae9a39a5911b85acd40b99af' 
  AND token = '3wvf5zKr77uEpef5nZ7+R+T0eCG32jKov1J14MFxAU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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