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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07753e1e75373d4ea3b6bcf1e0accd02b9511e6c59028583d0aec5ab0a38e64e' 
  AND token = 'yy2AyJj/RvS83z6Qj/8SvBoMzGbuWilan9whfX7gVuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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