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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93e88ca378f816792207d7d510a4a6733e53d4b1c537c7822d077892499f78b' 
  AND token = 'bsKC33u21lz21L6vsqForzHxCjVFlMMvIYgf6GTQsIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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