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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb9c95bf9b2fb2cecadf66c676acfe6e34fa8a2e9a6860da8983be9114d2b38' 
  AND token = 's/oXMyyoceLy17mOnFlQxxC/HgJKZmFrz79hTyXk+1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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