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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93083bd8cce206bcb2b6b9fb0dbab0f55d1c0344f457657563ee82190b0308e' 
  AND token = 'Cn4Ou03UVgW7S/LQO9Ii8NLOmDxBciP+G9LLhf0ZxHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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