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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9617f012ec7f6cb9bc0095a4c2a0ad440fc517ba9d6e8e0349552b0bb04e15a1' 
  AND token = 'aHdIQxLzJJJ+aaR90MROPJW6FBMCEnrBHnjMOBDz0rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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