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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ee013ef5e73db0e903efce8fc82ee0f5ea856b8d48d83bb9af7a8dd89bf1e1' 
  AND token = '/BSQxN9o6mzMGmTITTjCR4TKgr4bcAwXIjkIfQGuf4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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