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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259cfe1a97eb8a8571cf4b8460fe0593e408792843a1f107a17e70623ece972e' 
  AND token = 'iv4d3xuD2Pwfj6pioZ7B5Wkq20xY73BmK7VfjHiIjAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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