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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c8415da6de2a12dc49684f0671e5140f5306d3cf924e3980827ceb550ebe1c' 
  AND token = '2IlTvlXJvc6lHy4EOUrjoMZoo03geLYNGAw3aN/F8y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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