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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ce80d0bb1ecb243d907d4a934eef00251ab2cc61e1746046cfe1bc1eac4d96' 
  AND token = 'MbcXeQLZlCqoF86HeNqVboCshZP2zrjO2nIQdcxR+00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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