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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5255896184e15035160cf9efece141a58e1f8fc4e3846f7c4d385e1509dda9' 
  AND token = '0Zpg09ss0ahItP/agxDhJp11KTGi021TvE/oL3JDZZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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