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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048841fc582a8593609cfa36d5ad590107ee3ae9fda44536bc8c4fd59ebe57d9' 
  AND token = 'YLzW8VDArLVi/5FR5UrNwl9eRGooi0DRQAe6ofG4AVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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