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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c080d2b8306f7a0c34920f6b503c752d7e39c082b184e962c2e92e0eddf6bc' 
  AND token = '1ecw/0Z1hExp0FZrSKXku41gClHGqvUZEim2bQVIYcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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