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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f987f8026f5fe487655d91daa8e41fec4e10ec9495787898add9a2f2962bc742' 
  AND token = 'BRDhiWgMPEDQ0zs5xhaKmL3fzvdI2QNLFk+b8tUm5dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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