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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d6798e4af2d4514b3cec43765046a1c04544230eb4af3e36612213e52728e1' 
  AND token = 'ENF+B1UDSaPtAIUspjLroXwjS6jhSJaoAkkEnonZkQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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